I don't own Zelda. That being said, if Nintendo want to make any offers, I'm always listening.
Link fell, aiming his bow. This was the last of the four spots on Vah Rutah's back, and with this arrow, the dungeon would be open. Sure enough, the arrow struck true, and Link fell through the air, landing in the water. Sidon swam him over to the now-open door, and Link stepped on the platform, expecting to have to go through the dungeon alone again.
To his surprise, Sidon stepped on next to him. Link looked over, shocked. Sidon grinned. "You didn't think I'd make my new friend go into a mysterious dungeon alone, did you? You barely survived a little swim in a river!" Link smiled too, Sidon's grinning being mysteriously contagious. The two fist bumped as the platform took them inside of the Divine Beast.
As he was fighting the first mini-guardian, Link remembered that Sidon had no weapons! Quckly, he grabbed a Traveler's Spear from his bag, and tossed it to his friend. Sidon caught it, and dealt the final blow to the guardian. "Thanks friend!" He exclaimed, hoisting it over his shoulder.
The two dealt with the puzzles easily, as having an extra person was kind of cheating. Soon, they found themselves at the main control terminal, and Link placed the Sheikah Slate in the slot. With a roar, Waterblight Ganon burst out of the bulb-like ancient computer. He charged, Link and Sidon standing firm on the water-coated floor.
Quickly, out of instinct, Link shot Waterblight in the eye with a shock arrow. The beast fell, and Sidon started slashing at it with his spear. A few seconds later, the beast was back up, and the two heroes took cover behind a cryonis pillar. Link shot it a couple more times, and the two quickly brought it down to half health. That's when things got fun.
The first time Link had done this, he'd been clumsily jumping from cryonis to cryonis in the submerged room, trying to dodge the hits from Waterblight. This time, Link jumped back on Sidon's back, and the two swam around it, shooting randomly with shock arrows. With a cry of rage, Waterblight swung its trident around, hitting Link in the gut and knocking him breathless onto a platform. With just half a heart left, Link watched helplessly as the creature prepared to strike. But the blow never fell.
With a blast of ghostly fire, Sidon leaped out of the water, holding his sister's trident. The ghost of Mipha had powered this final strike, and Sidon knew it well. As the magic trident hit it's mark, Sidon shouted "This is for my sister, you piece of Lynel dung!" The monster collapsed, and with an embarrassing squeal, disappeared into smoke.
Sidon helped Link to his feet, fastening the trident to his back. The two turned to leave when a ghostly voice floated through the room.
"Did you two really think that was the only help you would get?" Shocked, Sidon and Link turned to see the blue, transparent figure of a young Zora woman, smiling at them. With a cry of joy, Sidon ran forward and tried to embrace his sister, only to fall through her. She giggled, remembering how her brother used to be small. "I'm afraid I cannot achieve corporeal form anytime soon, and my time even incorporeal is short. Link, my love, and Sidon, my brother, you two have fought well, and freed me from that monster's grip. To show my gratitude, I will leave you two great gifts! To my brother, I bestow the power of my trident. It shall serve you well, and will not break so long as you are alive. I want you to remember me by it. Link, I give you my Grace. It will heal you from the most dire of wounds, as I always used to do." Sidon and Link looked on, tears in their eyes.
"Sister, I thank you!" Sidon said, almost crying, but still grinning. "for this trident, and for returning to me, even if it is just for a short time. It feels good just to see you before me again!" At this, Mipha smiled.
"I love you too, brother, and that is why it pains me to do this to you. I am fading fast, and I will not be able to take care of Vah Rutah for much longer. That is why I am asking you to stay with her, and when Link needs you most, to strike at the heart of Ganon. When this is all done, and the light magic is returned to Hyrule, maybe I'll return someday, but for now I need you to do this." She floated back a single tear running down her cheek. "And maybe we can be a family again someday."
Sidon knelt before her, watching as she faded away. Taking the trident out, he stood up, gripping it with determination. "I will not fail you, sister!" He turned to Link. "That reminds me, I still haven't opened your package, have I not?"
Link shook his head no, and Sidon opened it, taking the contents out. He grinned, holding a red version of the Champion's Tunic and a Sheikah Slate with the Zora crest on it. He slid the tunic on, and stood proudly, looking around his divine beast. "Well now, I'd best get to work! This place needs some fixing up!" He turned to Link. "I'd love to have you stay, but you probably have to save the other beasts, don't you?"
Link gave a nod, and started to walk away. Before he knew what was happening, he was grabbed from behind in a tight embrace. "Link, thank you for helping me save my people. I'm proud to call you my brother." With that, Sidon released him, and Link left to continue his adventure!
A mile away, the king of the Zora looked up. It had stopped raining, a few hours ago, and while everything else had dried somewhat, his daughter's statue was as wet as if it were still raining. He smiled, thinking to himself: 'Thank you, hero'
Aaaand, done! Whew, that was a long chapter! Anyways, guys, thanks for reading as always! Tune in next time to see Link take a break from his adventures to go visit Kakariko Village and reclaim what is his!